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The attack on the 68-year-old man was recorded, shared on social media and sparked outrage in the community.
The Los Angeles County Sheriff's Department thanked the person who called in the sighting of the stolen hearse.
McHenry tweeted that she has a brain tumor and that surgery is imminent. "Thank you for continued support and understanding at this time," she said.
Police identified the five employees who were killed and the co-worker who opened fire at the campus known locally as Miller Valley.
The UC Davis patient is not believed to have had exposure through travel or a known infected individual — so health officials have to find the "invisible line of transmission," one expert said.